Bolt-extractor.



T. A. CHRISTIAN.

BOLT EXTRACTOR. APPLICATION FILED MAY 20. 1918.

Patented Apr. 8,1919.

BEIGE. I

THOMAS A. CHRISTIAN, or MERCED FALLS, CALIFORNIA, ASSIG o oF oNE- 'rI IRD TO F ED A. STEWART AND ONE-THIRD T0 LEMUEL F. LONG, BOTH or MERCED FALLS,

CALIFORNIA.

BOLT-EXTRACTOB.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application fi led May 20, 1918. Serial No. 235,541.

To all whom it may concern:

Be it known that I, THOMAS A. CHRIS- TIAN, a citizen of Great Britain, residing at Mer'ced Falls, in the county of Merced and State of California, have invented certain new and useful Improvements in Bolt-Extractors, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to devices for extracting bolts from the work in which the bolts or like articles are disposed, and the general object of the invention is to provide a very simple and cheaply made device for this purpose which has few parts and which can be easily assembled.

A further object is to provide a construction of this character of such form that a straight pull will be exerted upon the bolt, and further of such form that the pulling device may progress step by step along the bolt as the latter is withdrawn.

Other objects will appear in the course of the following description.

In the accompanying drawings:

Figure 1 is a side elevation of a bolt eX- tractor constructed in accordance with my invention.

Fig. 2 is a front elevation of the construction illustrated in Fig. 1. the standard 21 being omitted.

Fig. 3 is a fragmentary inside face View of one of the jaws.

Fig. i is a like view of the other jaw.

Fig. 5 is a top plan view of the lever 20.

Fig. 6 is a like view of Fig. 1 but showing two levers.

Referring to these figures it will be seen that my improved pulling device consists of two jaws designated generally 10 and 11. The jaw 10 has a centrally disposed opening which is shown as rectangular in form and designated 12. The jaw or member 11 has width such that it may be inserted through the opening 12, and this jaw 11 is also formed with a centrally disposed opening 13. The jaw 11 is pivoted to the jaw 10 by means of a pivot bolt, stud, pin or trunnion designated 14, and the inner face of each jaw is cut away as at 1,5 to provide the biting edges 16 which confront each other.

Each jaw is provided. with a longitudinally extending shank 17 terminating in an eve. 18 with these eyes are engaged the links 19,- these links 19 are convergently disposed and may beconnected in suitable manner to a lever 20 mounted upon a standard 21 havinga base 22. t This lever is bifurcated at one end as at 23 and isprovided with the laterally extending eyes 24 to receive the links 19. h

In the use of this device, assuming that a bolt is to be withdrawn, the jaws areopened and disposed over the extremity of the bolt and an upward pull upon the links 19 will now cause the jaws to close upon each other, that is it will cause the biting edges 16 of the jaws to be urged toward each other and into biting engagement with .the bolt, and the greater the force applied to the links 19 the greater will be the binding action of the jaws upon the bolt. The outer end of the lever is depressed and this raises the bolt a corresponding amount and then the lever is raised which causes the jaws to" shift downward on the bolt. The openings 10 and 11 permit the bolt to pass upward between the jaws and it will be seen that because of these openings the jaws have a direct pull on the bolt, that is that the direction in which the lifting force is applied is in line with the bolt itself. By oscillating the lever therefore the bolt may be withdrawn step by step from the work.

I do not wish to limit myself to the use of one lever as two levers 20 may be used in the manner illustrated at Fig. 6. These levers being engaged with the links 19 in the manner shown. It will be seen that inasmuch as the levers are bifurcated So as to provide the openings 23 that these levers will not impede the upward movement of the bolt, or the downward movement of the jaws upon the bolt. j

I am aware that many tools have been devised for pulling bolts but as far as I know these tools do not hold the bolts straight, nor can these devices continue pulling upon a bolt and withdraw the same without building up the piece upon which the device'rests after each lift has been made.

My device is designed to remove a bolt without injuring the thread and it will withdraw bolts from either wood or iron. By this device it is possible to withdraw a bolt 3% inches at a time at each stroke of the lever 20 and by using a lever and jaws as directed one man can exert a pull of about five thousand pounds. By using two levers of course double this power can be applied to the bolt. My device may be used even where the bolt is disposed among timbers, inasmuch as connections may be made between the links 19 and the levers which will permit the levers to be disposed a considerable distance above the timbers and it will also be obvious that the length of the bolt does not in any way affect the operation of this device inasmuch as the bolt and its head passes through the openings 10 and 11.

It will be seen that this extractor comprises very few parts and that these may be cheaply made and readily assembled, and further that thejaws may be made so heavy as to sustain very great strain.

This bolt extracting tool is of particular value because of the fact that there are thousands of feet of large timbers in abandoned vessels and harbors and in like situations which can not be used because there is no practical methodmof getting the timbers apart. With my bolt extractor, however, it

is a relatively easy matter to remove the bolts from these timbers and it is also of particular value in connection with wrecking operations. It is tobe noted that the gripping edges of the jaws are about short on each jaw, in order that the inner line of draft shall be the same on standard head bolts, as the inner jaws would be on the shank of the bolt.

evident that inany'changes may bemade in the details of construction without departing from the spirit of the invention as de- 'fined in the appended claim.

Having described my invention what I claim is;

A bolt extractor comprising a pair of jaws, each of said jaws having a centrally disposed opening and each aw having a relatively elongated shank extending therefrom, one of said jaws being disposed through the opening of the other jaw and being pivoted to the last named jaw and both of said jaws being formed at their lower ends with confronting inwardly extending gripping jaws, the shanks of the jaws being in divergent relation, the outer ends of the jaws being formed with eyes, links swingingly connected to said eyes, and a bifurcated lifting lever having eyes with which said links are swingingly connected.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

. THOMAS A. OHRISTIA N.

Witnesses:

FRANK WM. Moonn, SIGMUND E. Bnnrrzriorr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent Washington, D. C. 

